diff --git a/src/d_iwad.cpp b/src/d_iwad.cpp
index 7f9bc60fedf..3ad6ed00486 100644
--- a/src/d_iwad.cpp
+++ b/src/d_iwad.cpp
@@ -111,6 +111,12 @@ void FIWadManager::ParseIWadInfo(const char *fn, const char *data, int datasize,
 						iwad->prio = sc.Number;
 					}
 				}
+				else if (sc.Compare("SupportWAD"))
+				{
+					sc.MustGetStringName("=");
+					sc.MustGetString();
+					iwad->SupportWAD = sc.String;
+				}
 				else if (sc.Compare("Config"))
 				{
 					sc.MustGetStringName("=");
@@ -562,6 +568,18 @@ void FIWadManager::ValidateIWADs()
 
 static bool havepicked = false;
 
+
+FString FIWadManager::IWADPathFileSearch(const FString &file)
+{
+	for(const FString &path : mSearchPaths)
+	{
+		FString f = path + "/" + file;
+		if(FileExists(f)) return f;
+	}
+
+	return "";
+}
+
 int FIWadManager::IdentifyVersion (std::vector<std::string>&wadfiles, const char *iwad, const char *zdoom_wad, const char *optional_wad)
 {
 	const char *iwadparm = Args->CheckValue ("-iwad");
@@ -802,11 +820,11 @@ int FIWadManager::IdentifyVersion (std::vector<std::string>&wadfiles, const char
 	D_AddFile (wadfiles, zdoom_wad, true, -1, GameConfig);
 
 	// [SP] Load non-free assets if available. This must be done before the IWAD.
-	int iwadnum;
+	int iwadnum = 1;
 	if (D_AddFile(wadfiles, optional_wad, true, -1, GameConfig))
-		iwadnum = 2;
-	else
-		iwadnum = 1;
+	{
+		iwadnum++;
+	}
 
 	fileSystem.SetIwadNum(iwadnum);
 	if (picks[pick].mRequiredPath.IsNotEmpty())
@@ -818,6 +836,17 @@ int FIWadManager::IdentifyVersion (std::vector<std::string>&wadfiles, const char
 	fileSystem.SetMaxIwadNum(iwadnum);
 
 	auto info = mIWadInfos[picks[pick].mInfoIndex];
+
+	if(info.SupportWAD.IsNotEmpty())
+	{
+		FString supportWAD = IWADPathFileSearch(info.SupportWAD);
+
+		if(supportWAD.IsNotEmpty())
+		{
+			D_AddFile(wadfiles, supportWAD.GetChars(), true, -1, GameConfig);
+		}
+	}
+
 	// Load additional resources from the same directory as the IWAD itself.
 	for (unsigned i=0; i < info.Load.Size(); i++)
 	{
diff --git a/src/d_main.h b/src/d_main.h
index 49e9846be1a..0d4a33079cd 100644
--- a/src/d_main.h
+++ b/src/d_main.h
@@ -76,6 +76,7 @@ struct FIWADInfo
 	FString Name;			// Title banner text for this IWAD
 	FString Autoname;		// Name of autoload ini section for this IWAD
 	FString IWadname;		// Default name this game would use - this is for IWAD detection in GAMEINFO.
+	FString SupportWAD;		// Optional support WAD, load if present (initially implemented for id24)
 	int prio = 0;			// selection priority for given IWAD name.
 	FString Configname;		// Name of config section for this IWAD
 	FString Required;		// Requires another IWAD
@@ -133,7 +134,9 @@ class FIWadManager
 	void CollectSearchPaths();
 	void AddIWADCandidates(const char *dir);
 	void ValidateIWADs();
+	FString IWADPathFileSearch(const FString &file);
 public:
+
 	FIWadManager(const char *fn, const char *fnopt);
 	const FIWADInfo *FindIWAD(std::vector<std::string>& wadfiles, const char *iwad, const char *basewad, const char *optionalwad);
 	const FString *GetAutoname(unsigned int num) const
diff --git a/wadsrc_extra/static/iwadinfo.txt b/wadsrc_extra/static/iwadinfo.txt
index 8eb7f1522cb..985df8b5d36 100644
--- a/wadsrc_extra/static/iwadinfo.txt
+++ b/wadsrc_extra/static/iwadinfo.txt
@@ -338,6 +338,7 @@ IWad
 		          "DMENUPIC", "M_ACPT", "M_CAN", "M_EXITO", "M_CHG"
 	BannerColors = "54 54 54", "a8 a8 a8"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -356,6 +357,7 @@ IWad
 	Load = "extras.wad"
 	BannerColors = "00 7c 00", "a8 a8 a8"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -374,6 +376,7 @@ IWad
 	Load = "extras.wad", "soundtrack"
 	BannerColors = "00 7c 00", "a8 a8 a8"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -388,6 +391,7 @@ IWad
 	MustContain = "SMOOSHED", "ANIMDEFS", "LANGUAGE", "MAPINFO", "ENDOOM", "M_DOOM", "TITLEPIC", "TEXTURES"
 	BannerColors = "a8 00 00", "a8 a8 a8"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -404,6 +408,7 @@ IWad
 		          "DPHOOF","BFGGA0","HEADA1","CYBRA1","SPIDA1D1", "E4M2", "E1M10", "SEWERS"
 	BannerColors = "18 18 18", "a8 a8 a8"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -420,6 +425,7 @@ IWad
 		          "DPHOOF","BFGGA0","HEADA1","CYBRA1","SPIDA1D1", "E4M2"
 	BannerColors = "54 54 54", "a8 a8 a8"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -436,6 +442,7 @@ IWad
 		          "DPHOOF","BFGGA0","HEADA1","CYBRA1","SPIDA1D1"
 	BannerColors = "54 54 54", "a8 a8 a8"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -449,6 +456,7 @@ IWad
 	MustContain = "E1M1"
 	BannerColors = "54 54 54", "a8 a8 a8"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -463,6 +471,7 @@ IWad
 	MustContain = "MAP01", "REDTNT2", "DMAPINFO"
 	BannerColors = "00 7c 00", "a8 a8 a8"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -478,6 +487,7 @@ IWad
 	BannerColors = "a8 00 00", "a8 a8 a8"
 	Load = "extras.wad"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -492,6 +502,7 @@ IWad
 	MustContain = "MAP01", "REDTNT2"
 	BannerColors = "a8 00 00", "a8 a8 a8"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -506,6 +517,7 @@ IWad
 	MustContain = "MAP01", "CAMO1", "DMAPINFO"
 	BannerColors = "00 7c 00", "a8 a8 a8"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -521,6 +533,7 @@ IWad
 	BannerColors = "a8 00 00", "a8 a8 a8"
 	Load = "extras.wad"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -535,6 +548,7 @@ IWad
 	MustContain = "MAP01", "CAMO1"
 	BannerColors = "a8 00 00", "a8 a8 a8"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -550,6 +564,7 @@ IWad
 	BannerColors = "a8 00 00", "a8 a8 a8"
 	Load = "nerve.wad"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -565,6 +580,7 @@ IWad
 	BannerColors = "00 7c 00", "a8 a8 a8"
 	IgnoreTitlePatches = 1
 	Load = "extras.wad"
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -580,6 +596,7 @@ IWad
 	BannerColors = "00 7c 00", "a8 a8 a8"
 	IgnoreTitlePatches = 1
 	Load = "nerveunity.wad", "extras.wad", "soundtrack"
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -596,6 +613,7 @@ IWad
 	IgnoreTitlePatches = 1
 	Load = "nerve.wad"
 	DeleteLumps = "M_EPI1", "M_EPI2", "M_EPISOD"
+	SupportWAD = "id24res.wad"
 }
 
 IWad
@@ -609,6 +627,7 @@ IWad
 	Compatibility = "Shorttex", "nosectionmerge"
 	MustContain = "MAP01", "WIOBJ"
 	BannerColors = "ff ff ff", "a8 00 00"
+	SupportWAD = "id24res.wad"
 }
 
 // Doom 2 must be last to be checked because MAP01 is its only requirement
@@ -624,6 +643,7 @@ IWad
 	MustContain = "MAP01"
 	BannerColors = "a8 00 00", "a8 a8 a8"
 	IgnoreTitlePatches = 1
+	SupportWAD = "id24res.wad"
 }